1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/* vi: set sw=4 ts=4: */
/*
* fstrim.c - discard the part (or whole) of mounted filesystem.
*
* 03 March 2012 - Malek Degachi <malek-degachi@laposte.net>
* Adapted for busybox from util-linux-2.12a.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config FSTRIM
//config: bool "fstrim (4.4 kb)"
//config: default y
//config: help
//config: Discard unused blocks on a mounted filesystem.
//applet:IF_FSTRIM(APPLET_NOEXEC(fstrim, fstrim, BB_DIR_SBIN, BB_SUID_DROP, fstrim))
//kbuild:lib-$(CONFIG_FSTRIM) += fstrim.o
//usage:#define fstrim_trivial_usage
//usage: "[OPTIONS] MOUNTPOINT"
//usage:#define fstrim_full_usage "\n\n"
//usage: " -o OFFSET Offset in bytes to discard from"
//usage: "\n -l LEN Bytes to discard"
//usage: "\n -m MIN Minimum extent length"
//usage: "\n -v Print number of discarded bytes"
#include "libbb.h"
#include <linux/fs.h>
#ifndef FITRIM
struct fstrim_range {
uint64_t start;
uint64_t len;
uint64_t minlen;
};
#define FITRIM _IOWR('X', 121, struct fstrim_range)
#endif
int fstrim_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fstrim_main(int argc UNUSED_PARAM, char **argv)
{
struct fstrim_range range;
char *arg_o, *arg_l, *arg_m, *mp;
unsigned opts;
int fd;
enum {
OPT_o = (1 << 0),
OPT_l = (1 << 1),
OPT_m = (1 << 2),
OPT_v = (1 << 3),
};
#if ENABLE_LONG_OPTS
static const char fstrim_longopts[] ALIGN1 =
"offset\0" Required_argument "o"
"length\0" Required_argument "l"
"minimum\0" Required_argument "m"
"verbose\0" No_argument "v"
;
#endif
opts = getopt32long(argv, "^"
"o:l:m:v"
"\0" "=1", fstrim_longopts,
&arg_o, &arg_l, &arg_m
);
memset(&range, 0, sizeof(range));
range.len = ULLONG_MAX;
if (opts & OPT_o)
range.start = xatoull_sfx(arg_o, kmg_i_suffixes);
if (opts & OPT_l)
range.len = xatoull_sfx(arg_l, kmg_i_suffixes);
if (opts & OPT_m)
range.minlen = xatoull_sfx(arg_m, kmg_i_suffixes);
mp = argv[optind];
//Wwhy bother checking that it's a blockdev?
// if (find_block_device(mp)) {
fd = xopen_nonblocking(mp);
/* On ENOTTY error, util-linux 2.31 says:
* "fstrim: FILE: the discard operation is not supported"
*/
xioctl(fd, FITRIM, &range);
if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
if (opts & OPT_v)
printf("%s: %llu bytes trimmed\n", mp, (unsigned long long)range.len);
return EXIT_SUCCESS;
// }
return EXIT_FAILURE;
}
|
